ASME B16.5 / B16.20 — Ring joint (RTJ) gasket — Class 2500
ASME B16.5 / B16.20 Ring joint (RTJ) gasket — Class 2500 — 14 sizes.
| NPS | Ring no. | Pitch dia. P (mm) | Ring width A (mm) | Height oval B (mm) | Height octagonal H (mm) |
|---|---|---|---|---|---|
| 1/2 | R-13 | 42.88 | 7.95 | 14.2 | 12.7 |
| 3/4 | R-16 | 50.8 | 7.95 | 14.2 | 12.7 |
| 1 | R-18 | 60.33 | 7.95 | 14.2 | 12.7 |
| 1-1/4 | R-21 | 72.24 | 11.13 | 17.5 | 16 |
| 1-1/2 | R-23 | 82.55 | 11.13 | 17.5 | 16 |
| 2 | R-26 | 101.6 | 11.13 | 17.5 | 16 |
| 2-1/2 | R-28 | 111.13 | 12.7 | 19.1 | 17.5 |
| 3 | R-32 | 127 | 12.7 | 19.1 | 17.5 |
| 4 | R-38 | 157.18 | 15.88 | 22.4 | 20.6 |
| 5 | R-42 | 190.5 | 19.05 | 25.4 | 23.9 |
| 6 | R-47 | 228.6 | 19.05 | 25.4 | 23.9 |
| 8 | R-51 | — | — | — | — |
| 10 | R-55 | — | — | — | — |
| 12 | R-60 | 406.4 | 31.75 | 39.6 | 38.1 |
- Class 2500 covers NPS 1/2–12 only; no NPS 3-1/2 ring.
- Tolerances: P ±0.18, A ±0.20, B/H +1.3/−0.5 mm.